40181191 has 2 divisors, whose sum is σ = 40181192. Its totient is φ = 40181190.

The previous prime is 40181159. The next prime is 40181233. The reversal of 40181191 is 19118104.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40181191 - 2⁵ = 40181159 is a prime.

It is a super-2 number, since 2×40181191² = 3229056220356962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40181111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20090595 + 20090596.

It is an arithmetic number, because the mean of its divisors is an integer number (20090596).

Almost surely, 2^40181191 is an apocalyptic number.

40181191 is a deficient number, since it is larger than the sum of its proper divisors (1).

40181191 is an equidigital number, since it uses as much as digits as its factorization.

40181191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 25.

The square root of 40181191 is about 6338.8635416769. The cubic root of 40181191 is about 342.5107986721.

Adding to 40181191 its reverse (19118104), we get a palindrome (59299295).

The spelling of 40181191 in words is "forty million, one hundred eighty-one thousand, one hundred ninety-one".